Flynn v. State
In Flynn v. State, 847 P.2d 1073 (Alaska Ct. App. 1993) the court concluded that a police sergeant's expert testimony "that he had 'yet to have an innocent person confess' was tantamount to a statement of his professional opinion that [the appellant] had confessed truthfully and was therefore guilty as charged." Flynn, 847 P.2d at 1075.
The appellant had objected unsuccessfully to the testimony. Id. The appellant's "confession was central to the prosecution's case at trial; yet the circumstances surrounding the confession rendered [the appellant's] claim of coercion at least arguably plausible." Id. at 1076.
The appellate court concluded that the trial court had abused its discretion in admitting the testimony. Id.